Crossword on Elements

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Across
  1. 3. I have 3 shells and my valency is 4 (7)
  2. 4. I have only one shell and my valency is 1 (6)
  3. 7. My symbol is 'S' (7)
  4. 9. I have 2 valencies-3 and 5 (10)
  5. 10. I am found in a greenhouse gas.My mass number is 12. (6)
  6. 12. My mass number is 35.5 (8)
  7. 13. I have 12 neutrons and 12 protons (9)
  8. 14. My atomic number is 13 (9)
Down
  1. 1. My symbol is 'B' (5)
  2. 2. I have 4 neutrons (7)
  3. 5. I have a valency of 0 and have 3 shells (5)
  4. 6. I have 2 shells and each shell has 2 electrons (9)
  5. 8. I am a component of water and my atomic number is 1 (8)
  6. 9. My mass number is 39 and my symbol is 'K' (9)
  7. 11. My symbol is 'Na' (6)